Originally Posted by
dabac
With brake lever pivot point I'm referring to the part that the brake lever hinges on/around. I'm quite curious to how you manage to adjust that one short of doing some serious machining on the lever and its housing. You must be thinking about some other part of the assembly.
Look at the pic, The lever pivots around the stubby axle just below and to the right of the return spring. Turning the adjustment screw will effectively change the amount of leverage and stroke that the brake lever has.
The fact that there is an oblong bit between where the cable hooks on and where the adjustment is carried out doesn't change a thing, it's just acting as a linkage and doesn't influence the basic issue of the way the leverage changes as the adjustment is turned up or down.
Turning the Speed Dial screw does change the leverage but it doesn't move the cable anchor point. All the screw does is move the end of the cable anchor up and down in a plane. The end of the anchor that is attached to the screw has a pivot in it so that moving it up or down changes the pivot point of the whole system. The end of the cable stays in the same spot and no extra cable length is added or subtracted.